Double Factorial Prime
المؤلف:
Sloane, N. J. A
المصدر:
Sequences A007749 and A080778 in "The On-Line Encyclopedia of Integer Sequences."
الجزء والصفحة:
...
15-5-2019
2340
Double Factorial Prime
A double factorial prime is a prime number of the form 
, where 
is a double factorial.
is prime for 
, 4, 6, 8, 16, 26, 64, 82, 90, 118, 194, 214, 728, ... (OEIS A007749), the largest of which are summarized in the following table.
 |
digits |
discoverer |
 |
169,435 |
S. Fukai (Jun. 5, 2015) |
 |
229,924 |
S. Fukai (Jun. 5, 2015) |
 |
344,538 |
S. Fukai (Apr. 21, 2016) |
is prime for 
, 1, 2, 518, 33416, 37310, 52608, 123998, ... (OEIS A080778), the largest of which are summarized in the following table.
 |
digits |
discoverer |
 |
112,762 |
H. Jamke (Jan. 3, 2008) |
 |
288,864 |
S. Fukai (Jun. 5, 2015) |
REFERENCES:
Sloane, N. J. A. Sequences A007749 and A080778 in "The On-Line Encyclopedia of Integer Sequences."
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